diff src/filters/pixel.cpp @ 1:f9f4f1b99eed

importing src directory
author Robert McIntyre <rlm@mit.edu>
date Sat, 03 Mar 2012 10:31:27 -0600
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     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/filters/pixel.cpp	Sat Mar 03 10:31:27 2012 -0600
     1.3 @@ -0,0 +1,196 @@
     1.4 +#include "../Port.h"
     1.5 +
     1.6 +extern u32 RGB_LOW_BITS_MASK;
     1.7 +
     1.8 +void Pixelate2x16(u8 *srcPtr, u32 srcPitch, u8 *deltaPtr,
     1.9 +                  u8 *dstPtr, u32 dstPitch, int width, int height)
    1.10 +{
    1.11 +	u8 *nextLine, *finish;
    1.12 +	u32 colorMask = ~(RGB_LOW_BITS_MASK | (RGB_LOW_BITS_MASK << 16));
    1.13 +	colorMask = (colorMask >> 2) & (colorMask >> 1);
    1.14 +
    1.15 +	nextLine = dstPtr + dstPitch;
    1.16 +
    1.17 +	do
    1.18 +	{
    1.19 +		u32 *bP = (u32 *) srcPtr;
    1.20 +		u32 *xP = (u32 *) deltaPtr;
    1.21 +		u32 *dP = (u32 *) dstPtr;
    1.22 +		u32 *nL = (u32 *) nextLine;
    1.23 +		u32  currentPixel;
    1.24 +		u32  nextPixel;
    1.25 +		u32  currentDelta;
    1.26 +		u32  nextDelta;
    1.27 +
    1.28 +		finish    = (u8 *) bP + ((width+2) << 1);
    1.29 +		nextPixel = *bP++;
    1.30 +		nextDelta = *xP++;
    1.31 +
    1.32 +		do
    1.33 +		{
    1.34 +			currentPixel = nextPixel;
    1.35 +			currentDelta = nextDelta;
    1.36 +			nextPixel    = *bP++;
    1.37 +			nextDelta    = *xP++;
    1.38 +
    1.39 +			if ((nextPixel != nextDelta) || (currentPixel != currentDelta))
    1.40 +			{
    1.41 +				u32 colorA, colorB, product;
    1.42 +
    1.43 +				*(xP - 2) = currentPixel;
    1.44 +#ifdef WORDS_BIGENDIAN
    1.45 +				colorA = currentPixel >> 16;
    1.46 +				colorB = currentPixel & 0xffff;
    1.47 +#else
    1.48 +				colorA = currentPixel & 0xffff;
    1.49 +				colorB = currentPixel >> 16;
    1.50 +#endif
    1.51 +				product = (colorA >> 2) & colorMask;
    1.52 +
    1.53 +#ifdef WORDS_BIGENDIAN
    1.54 +				*(nL) = (product << 16) | (product);
    1.55 +				*(dP) = (colorA << 16) | product;
    1.56 +#else
    1.57 +				*(nL) = product | (product << 16);
    1.58 +				*(dP) = colorA | (product << 16);
    1.59 +#endif
    1.60 +
    1.61 +#ifdef WORDS_BIGENDIAN
    1.62 +				colorA = nextPixel >> 16;
    1.63 +#else
    1.64 +				colorA = nextPixel & 0xffff;
    1.65 +#endif
    1.66 +				product = (colorB >> 2) & colorMask;
    1.67 +#ifdef WORDS_BIGENDIAN
    1.68 +				*(nL + 1) = (product << 16) | (product);
    1.69 +				*(dP + 1) = (colorB << 16) | (product);
    1.70 +#else
    1.71 +				*(nL + 1) = (product) | (product << 16);
    1.72 +				*(dP + 1) = (colorB) | (product << 16);
    1.73 +#endif
    1.74 +			}
    1.75 +
    1.76 +			dP += 2;
    1.77 +			nL += 2;
    1.78 +		}
    1.79 +		while ((u8 *) bP < finish);
    1.80 +
    1.81 +		deltaPtr += srcPitch;
    1.82 +		srcPtr   += srcPitch;
    1.83 +		dstPtr   += dstPitch << 1;
    1.84 +		nextLine += dstPitch << 1;
    1.85 +	}
    1.86 +	while (--height);
    1.87 +}
    1.88 +
    1.89 +void Pixelate2x32(u8 *srcPtr, u32 srcPitch, u8 * /* deltaPtr */,
    1.90 +                  u8 *dstPtr, u32 dstPitch, int width, int height)
    1.91 +{
    1.92 +	u8 *nextLine, *finish;
    1.93 +	u32 colorMask = ((u32)~RGB_LOW_BITS_MASK >> 2) & ((u32)~RGB_LOW_BITS_MASK >> 1);
    1.94 +
    1.95 +	nextLine = dstPtr + dstPitch;
    1.96 +
    1.97 +	do
    1.98 +	{
    1.99 +		u32 *bP = (u32 *) srcPtr;
   1.100 +		//    u32 *xP = (u32 *) deltaPtr;
   1.101 +		u32 *dP = (u32 *) dstPtr;
   1.102 +		u32 *nL = (u32 *) nextLine;
   1.103 +		u32  currentPixel;
   1.104 +		u32  nextPixel;
   1.105 +
   1.106 +		finish    = (u8 *) bP + ((width+1) << 2);
   1.107 +		nextPixel = *bP++;
   1.108 +
   1.109 +		do
   1.110 +		{
   1.111 +			u32 product;
   1.112 +
   1.113 +			currentPixel = nextPixel;
   1.114 +			nextPixel    = *bP++;
   1.115 +			product = (currentPixel >> 2) & colorMask;
   1.116 +			*(nL)   = product;
   1.117 +			*(nL+1) = product;
   1.118 +			*(dP)   = currentPixel;
   1.119 +			*(dP+1) = product;
   1.120 +
   1.121 +			currentPixel = nextPixel;
   1.122 +			nextPixel = *bP++;
   1.123 +			product   = (currentPixel >> 2) & colorMask;
   1.124 +			*(nL + 2) = product;
   1.125 +			*(nL + 3) = product;
   1.126 +			*(dP + 2) = currentPixel;
   1.127 +			*(dP + 3) = product;
   1.128 +
   1.129 +			dP += 4;
   1.130 +			nL += 4;
   1.131 +		}
   1.132 +		while ((u8 *) bP < finish);
   1.133 +
   1.134 +		srcPtr   += srcPitch;
   1.135 +		dstPtr   += dstPitch << 1;
   1.136 +		nextLine += dstPitch << 1;
   1.137 +	}
   1.138 +	while (--height);
   1.139 +}
   1.140 +
   1.141 +// generic Pixelate Nx magnification filter
   1.142 +template <int magnification, typename ColorType>
   1.143 +void PixelateNx(u8 *srcPtr, u32 srcPitch, u8 * /* deltaPtr */,
   1.144 +                u8 *dstPtr, u32 dstPitch, int width, int height)
   1.145 +{
   1.146 +	ColorType colorMask = ((ColorType)~RGB_LOW_BITS_MASK >> 2) & ((ColorType)~RGB_LOW_BITS_MASK >> 1);
   1.147 +
   1.148 +	srcPitch      = srcPitch / sizeof(ColorType) - width;
   1.149 +	u32 dstNextP  = dstPitch / sizeof(ColorType);
   1.150 +	u32 dstNextL  = (dstNextP - width) * magnification; // skip to the next magnificated 'line'
   1.151 +	dstNextP     -= magnification;
   1.152 +
   1.153 +	u32 offset    = (dstPitch + sizeof(ColorType)) * magnification - dstPitch;
   1.154 +
   1.155 +	ColorType *src   = (ColorType *)srcPtr;
   1.156 +	ColorType *dst   = (ColorType *)dstPtr;
   1.157 +
   1.158 +	do // per src line
   1.159 +	{
   1.160 +		u8 *finishP = (u8 *)dst + offset;
   1.161 +		for (int x = 0; x < width; ++x) // per pixel in line
   1.162 +		{
   1.163 +			ColorType col    = *src;
   1.164 +			ColorType *dst2  = dst;
   1.165 +			u8 *finishM = (u8 *)(dst + magnification);
   1.166 +
   1.167 +			ColorType product = (col >> 2) & colorMask;
   1.168 +			do
   1.169 +			{
   1.170 +				*dst2 = product;
   1.171 +			} while ((u8 *)++dst2 < finishM);
   1.172 +			dst2    += dstNextP;
   1.173 +			finishM += dstPitch;
   1.174 +			do // dst magnificated pixel
   1.175 +			{
   1.176 +				*dst2++ = product;
   1.177 +				do
   1.178 +				{
   1.179 +					*dst2 = col;
   1.180 +				} while ((u8 *)++dst2 < finishM);
   1.181 +				dst2    += dstNextP;
   1.182 +				finishM += dstPitch;
   1.183 +			} while ((u8 *)dst2 < finishP);
   1.184 +
   1.185 +			++src;
   1.186 +			dst     += magnification;
   1.187 +			finishP += magnification * sizeof(ColorType);
   1.188 +		}
   1.189 +		src += srcPitch;
   1.190 +		dst += dstNextL;
   1.191 +	} while (--height);
   1.192 +}
   1.193 +
   1.194 +typedef void (*PixelateNxFP)(u8*, u32, u8*, u8*, u32, int, int);
   1.195 +
   1.196 +PixelateNxFP Pixelate3x16 = PixelateNx<3, u16>;
   1.197 +PixelateNxFP Pixelate3x32 = PixelateNx<3, u32>;
   1.198 +PixelateNxFP Pixelate4x16 = PixelateNx<4, u16>;
   1.199 +PixelateNxFP Pixelate4x32 = PixelateNx<4, u32>;